CIS3374 Final Review

CIS3374 Final Review - CIS3374 Final Exam Review Chapter 14...

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CIS3374 Final Exam Review Chapter 14 – Designing System Interfaces, Controls, and Security A. Types of System Interfaces 1. Inputs from other systems 2. Highly Automated Inputs 3. Inputs that are from data in external databases 4. Outputs that are to external databases 5. Outputs with minimal HCI 6. Outputs to other systems 7. Real-time Connections (both input and output) B. Review Steps in Input Design (Both OO and Structured) – focus on defining the system inputs, including user inputs, by analyzing models that were built during the analysis phase. The fundamental approach that analysts use to identify user and system inputs is to identify all information flows that cross the system boundary for each activity or use case. 1. Identify Devices and Mechanisms a. Devices – magnetic card strip readers, bar-code readers, optical character recognition readers and scanners, radio-frequency identification tags, touch screens and devices, electronic pens and writing surfaces, digitizers (digital cameras) b. Mechanisms – enter or update error-free data into the system. i. Capture the data as close to the originating source ii. Use electronic devices and automatic entry whenever possible iii. Avoid human involvement as much as possible iv. If information is available in electronic form, use it instead of reentering the information v. Validate and correct information at the time and location it is entered 2. Develop Lists of Required Inputs Structured – define the automation boundary on a data flow diagram. The designer analyzes each DFD fragment to determine the required inputs. The data flows that cross the boundary on
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the DFDs as inputs correspond to triggers for external events in the event table. The result of this task is a list of high-level inputs for the new system. OO – define the automation boundary on a system sequence diagram. C. Steps in Output Design (Both OO and Structured) 1. Determine Types of Output Structured – the data flows from an internal process to an eternal agent or external process identify the outputs. OO – messages that originate on internal classes and whose destination is an actor or another external system are the outputs. 2. Reports – all of these should be in the vocabulary. a. Detailed report b. Summary report c. Exception report d. Executive report e. Internal output f. External output 3. Screens – screen output is formatted like a printed report but displayed electronically. 4. Factors to Consider a. What is the objective of the report? b. Who is the intended audience? c. What is the media for presentation? D. Review Integrity Controls 1. Objectives (3) a. Ensure that only appropriate and correct business transactions occur b. Ensure that the transactions are recorded and processed correctly c. Protect and safeguard the assets of the organization (including hardware, software, and information)
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2. Input Integrity Controls – input controls are an additional level of verification that helps reduce errors on input data. a.
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This note was uploaded on 04/21/2008 for the course CIS 3374 taught by Professor Martin during the Fall '08 term at Texas State.

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CIS3374 Final Review - CIS3374 Final Exam Review Chapter 14...

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